From 97d45f98f22f39d6af400a45028221feda64c56e Mon Sep 17 00:00:00 2001
From: Volker Diels-Grabsch <v@njh.eu>
Date: Thu, 28 Nov 2024 19:42:01 +0100
Subject: [PATCH] ocamlPackages.melange: init at 4.0.1-52 + 4.0.0-51 +
 4.0.0-414

---
 .../tools/ocaml/melange/default.nix           | 83 +++++++++++++++++++
 pkgs/top-level/ocaml-packages.nix             |  2 +
 2 files changed, 85 insertions(+)
 create mode 100644 pkgs/development/tools/ocaml/melange/default.nix

diff --git a/pkgs/development/tools/ocaml/melange/default.nix b/pkgs/development/tools/ocaml/melange/default.nix
new file mode 100644
index 000000000000..c81ca2a6cf56
--- /dev/null
+++ b/pkgs/development/tools/ocaml/melange/default.nix
@@ -0,0 +1,83 @@
+{
+  buildDunePackage,
+  cmdliner,
+  cppo,
+  dune-build-info,
+  fetchurl,
+  jq,
+  lib,
+  makeWrapper,
+  menhirLib,
+  merlin,
+  nodejs,
+  ocaml,
+  ounit2,
+  ppxlib,
+  reason,
+  stdenv,
+  tree,
+}:
+
+let
+  pname = "melange";
+  versionHash =
+    if lib.versionAtLeast ocaml.version "5.2" then
+      {
+        version = "4.0.1-52";
+        hash = "sha256-kUlChqQtLX7zh90GK23ibMqyI/MIp0sMYLjkPX9vdTc=";
+      }
+    else if lib.versionAtLeast ocaml.version "5.1" then
+      {
+        version = "4.0.0-51";
+        hash = "sha256-940Yzp1ZXnN6mKVWY+nqKjn4qtBUJR5eHE55OTjGvdU=";
+      }
+    else
+      {
+        version = "4.0.0-414";
+        hash = "sha256-PILDOXYIyLvfv1sSwP6WSdCiXfpYdnct7WMw3jHBLJM=";
+      };
+  version = versionHash.version;
+  hash = versionHash.hash;
+in
+buildDunePackage {
+  inherit pname;
+  inherit version;
+  minimalOCamlVersion = "4.14";
+  src = fetchurl {
+    url = "https://github.com/melange-re/${pname}/releases/download/${version}/${pname}-${version}.tbz";
+    inherit hash;
+  };
+  nativeBuildInputs = [
+    cppo
+    makeWrapper
+  ];
+  propagatedBuildInputs = [
+    cmdliner
+    dune-build-info
+    menhirLib
+    ppxlib
+  ];
+  doCheck = true;
+  nativeCheckInputs = [
+    jq
+    merlin
+    nodejs
+    reason
+    tree
+  ];
+  checkInputs = [
+    ounit2
+  ];
+  postInstall = ''
+    wrapProgram "$out/bin/melc" --set MELANGELIB "$OCAMLFIND_DESTDIR/melange/melange:$OCAMLFIND_DESTDIR/melange/js/melange"
+  '';
+  meta = {
+    description = "Toolchain to produce JS from Reason/OCaml";
+    homepage = "https://melange.re/";
+    mainProgram = "melc";
+    license = lib.licenses.lgpl3;
+    maintainers = [
+      lib.maintainers.vog
+    ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 6f244496f514..35cb14aff535 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1070,6 +1070,8 @@ let
 
     mec = callPackage ../development/ocaml-modules/mec { };
 
+    melange = callPackage ../development/tools/ocaml/melange { };
+
     memprof-limits = callPackage ../development/ocaml-modules/memprof-limits { };
 
     memtrace = callPackage ../development/ocaml-modules/memtrace { };